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((t^2-x^2)*(((1-x)^2+t^2)^2)+((t^2+x^2)^2)*((1-x)^2-t^2))/(x-1/2)
((t^2-x^2)*(((1-x)^2+t^2)^2)+((t^2+x^2)^2)*((1-x)^2-t^2))/(x-1/2)
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